Not good enough to make attorney grade explanation. Explanation should explain, that because of a quirk of math, a ten percent decline from 100 to 90 must be followed by an ELEVEN POINT ONE increase to break even, resulting in decay of nearly one percent every day it declines followed by increases, and vice versa.
That's why except in these ballistic increases day after day, which are unusual to say the least, the momentum doubles as the ETF commodity double, as rise after rise compounds itself.
That's why AGQ skyrockets, and why ZSL is nickels and dimes. ZSL will never recover.